Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2015

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables provide the components of accumulated other comprehensive (loss) / income (AOCI) by component (in millions):

	Pension and Retiree Health and Welfare Benefit Itemsa			Equity Method Investments			Total
Balance at December 31, 2014	$	—		$	(2	)	$	(2	)
Other comprehensive income before reclassifications	—			(1		)	(1		)
Amounts reclassified from AOCI	—			—			—
Balance at September 30, 2015	$	—		$	(3	)	$	(3	)
Balance at December 31, 2013	$	251		$	(6	)	$	245
Other comprehensive income before reclassifications	—			4			4
Amounts reclassified from AOCI	(1		)	—			(1		)
Balance at September 30, 2014	$	250		$	(2	)	$	248

^a Amounts are net of tax.

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Reclassifications out of AOCIb
	Three Months Ended September 30,
Details about Accumulated Other Comprehensive Income Components	2015			2014			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Actuarial losses	$	(1	)	$	—		c
Prior service credits	1			1			c
	—			1			Total before tax
	—			—			Tax benefit / (expense)
Total reclassifications for the period	$	—		$	1		Net of tax
	Nine Months Ended September 30,
Details about Accumulated Other Comprehensive Income Components	2015			2014			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Actuarial losses	$	(3	)	$	(1	)	c
Prior service credits	2			2			c
	(1		)	1			Total before tax
	1			—			Tax benefit / (expense)
Total reclassifications for the period	$	—		$	1		Net of tax

^b Amounts in parenthesis indicate debits to the income statement.

^c This accumulated other comprehensive income component is included in the computation of net periodic pension cost and retiree health and welfare (see Note 8 for additional details).